Symptom: The Num Lock key does not seem to have any effect and the number keys do not work.
Cause: Upgrading from Gutsy to Hardy Heron 8.04. I keep my home folder on a separate partition and have it mounted on boot so something in my home folder configuration folders/files must be having a conflict with the Hardy settings.
Solution: System > Preferences > Keyboard > Mouse Keys. Untick the ‘Allow to control the pointer using keyboard’ tickbox.
Thanks oh glory thanks!!!!
My numlock works again.